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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
Overdominance leads to stabilizing selection that maintains both alleles in a population. A) The allele frequency converges to an equilibrium value irrespective of the initial frequency. In the example, w11 = 0.9, w12 = 1 and w22 = 0.8 and the equilibrium frequency of allele A is 0.667.election against a dominant allele present at an initial frequency of 0.70 in a population. The change in frequency of the allele over 100 generations is shown for three different selection coefficients. If s=1.0, the allele is eliminated in one generation.